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High-resolution ac-calorimetry studies of the quasi-two- dimensional organic superconductor kappa-(BEDT- TTF)2Cu(NCS)2

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Müller,  J.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Lang,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Helfrich,  R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Müller, J., Lang, M., Helfrich, R., Steglich, F., & Sasaki, T. (2002). High-resolution ac-calorimetry studies of the quasi-two- dimensional organic superconductor kappa-(BEDT- TTF)2Cu(NCS)2. Physical Review B, 65(14): 140509, pp. 140509-140509. doi:10.1103/PhysRevB.65.140509.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-3161-C
Abstract
We report high-resolution specific-heat measurements on the quasi-two-dimensional organic superconductor kappa-(BEDT- TTF)(2)Cu(NCS)(2), performed by using a sensitive ac-modulation technique. The main observations are (i) a discontinuity at T-c much in excess of what is expected for a weak-coupling BCS superconductor and (ii) a quasiparticle contribution to the specific heat with an exponentially weak temperature dependence at T< T-c. The latter finding is incompatible with an order parameter that vanishes at certain parts of the Fermi surface. The data for Tless than or equal toT(c) can be well described by a strong-coupling extension of the BCS theory - the alpha- model - similar to what has been recently found for the kappa- (BEDT-TTF)(2)Cu[N(CN)(2)]Br salt [Elsinger , Phys. Rev. Lett. 84, 6098 (2000)].